Transparent Mesh Touch Electrodes for In-Cell Display Signal Interference
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Solution Overview
Problem
In-cell touch display devices face interference between touch signals and display signals, particularly due to the complexity of layout caused by mutual-capacitance sense technology, making it difficult to integrate touch sensors within the display device effectively.
Innovation Solution
The implementation of transparent mesh-like touch electrodes integrated within the same layer as pixel electrodes, combined with self-capacitance sense technology and reflection shielding electrodes to reduce interference and simplify the manufacturing process, allowing for a more compact design and improved sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mutual-capacitance sense technology is used, then touch detection capability is achieved, but layout complexity increases and integration becomes difficult
Solution Approach 1:
The patent combines the touch sense electrode and pixel electrode into a single integrated electrode layer, eliminating the need for separate touch and display electrode systems. This merging approach reduces layout complexity while maintaining touch detection capability through self-capacitance sensing methodology.
2Volume of moving object
If touch sensors are integrated within the display device, then device miniaturization is achieved, but signal interference between touch and display signals increases
Solution Approach 1:
The patent applies different functional zones within the integrated electrode layer, where the same electrode structure serves dual purposes: display function in certain regions and touch sensing function in other regions. This local differentiation reduces signal interference while maintaining device miniaturization.
3Ease of manufacture
If transparent mesh-like touch electrodes are used, then manufacturing process is simplified, but sensitivity may be reduced due to mesh structure
Solution Approach 1:
The patent optimizes the mesh structure parameters including line width, spacing, and pattern density to maintain high touch sensitivity while preserving transparency. By carefully adjusting these parameters, the mesh electrode achieves both ease of manufacture through single-layer fabrication and sufficient sensitivity for accurate touch detection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution mitigates noise issues and simplifies the manufacturing process, enabling a more miniaturized touch display device with enhanced sensitivity and reduced interference between touch and display signals.
Implementation Method 1
In the capacitive touch detection technology, due to the electrostatic induction of touch, the sense electrode layer generates a voltage change, and the touch position can be detected by measuring the change of voltage.
Implementation Method 2
each touch sense electrode is formed by a plurality of transparent mesh-like touch electrodes surrounding the corresponding pixel electrodes
Data Source
AI summary
An in-cell touch display device includes: a lower substrate a thin film transistor layer, a common electrode layer, an electrode integration layer and a display material layer. The thin film transistor layer is arranged on the lower substrate, and includes a plurality of thin film transistors. The common electrode layer is arranged on the thin film transistor layer, and includes a plurality of common electrodes connected to each other. The electrode integration layer is arranged on the common electrode layer, and includes a plurality of pixel electrodes and a plurality of touch sense electrodes each corresponding to a group of the pixel electrodes. Each touch sense electrode is formed by a plurality of transparent mesh-like touch electrodes surrounding the corresponding pixel electrodes. The display material layer is arranged on the electrode integration layer, and includes a display material.